How to fix framebuffer output display problem?

[Mohamed AbdElwahed <mohameeed2010 hotmail com>]

I run Gtk/Xserver but i have a problem that when display Gtk windows or try to run video , the display is 
clipped i mean the top and left part of the (video image) / (GUI window) does not appear. i think i want to 
configure something in the code to correctly know where is the origin of my LCD display, i think curently the 
output display start drawing in an un-viewable area.any help , useful URL, document is greatly 
appreciated-----------------------------------------
thanks in advance
 
 
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